Omega DRA-MDM-11 is a data acquisition and transmission system designed for industrial applications. It allows for the collection of data from multiple sensors and its transmission over long distances using a single pair of wires. The system consists of a multiplexer (DRA-M-11) and a demultiplexer (DRA-DM-11) unit. The multiplexer collects data from up to 16 sensors and converts it into a digital signal. The demultiplexer receives the digital signal and converts it back into analog signals for output to the sensors.
Omega DRA-MDM-11 is a data acquisition and transmission system designed for industrial applications. It allows for the collection of data from multiple sensors and its transmission over long distances using a single pair of wires. The system consists of a multiplexer (DRA-M-11) and a demultiplexer (DRA-DM-11) unit. The multiplexer collects data from up to 16 sensors and converts it into a digital signal. The demultiplexer receives the digital signal and converts it back into analog signals for output to the sensors.
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WARNING: These products are not designed for use in, and should not be used for, patient connected
applications.
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Contents
1. GENERAL DESCRIPTION
2. MOUNTING INSTRUCTIONS
3. REPLACING FUSES
4. ASSEMBLING THE UNIT
5. DISTANCE SETTING
6. ALARM
7. CONNECTING THE DRA-DM-11 TO DRA-M-11
8. SPECIFICATIONS
1
2
The DRA-DM-11 is the de-multiplexer unit of DRA-MDM-11, Mux/deMux system.
The DRA-DM-11 unit receives the DRA-M-11 multiplexed current loop output, and
generates 16 current loop outputs having the same magnitude and order as input
to the DRA-M-11unit.
The DRA-DM-11 is equipped with an alarm feature which is displayed through
a flashing LED and a dry contact for external activation. The alarm will be turned
on whenever an interruption occurs in the communication leads.
Each current loop output is equipped with a LED indicator which lights only when
the current loop is closed.
2. MOUNTING INSTRUCTIONS
The DRA-DM-11 is designed for standard DIN rail mounting.
Place the unit on the upper part of the mounting rail with the fastening tab facing
down. Using a suitable flat screwdriver loosen the tab slightly and attach the unit
to the rail. Once the tab is loosened, ensure that the unit is fastened securely in
place.
1. GENERAL DESCRIPTION
3. REPLACING FUSES
To replace a blown fuse, disassemble the unit as follows:
3.1 Take off both terminal strips by removing the four screws at the edges.
Note :This action does not require disconnecting the cables connected to
the strips.
3.2 Remove the front panel using a suitable flat screwdriver. Press down gently
on the plastic springloaded tabs located in the slots on either side of the unit.
3.3 Disconnect the flat connectors which connect the front panel, printed circuit.
3.4 Replace the blown fuse.
WARNING: Never install a data input fuse rated more than
100mA, and a main fuse rated more than 800mA
3
4. ASSEMBLING THE UNIT
The DRA-DM-11 unit includes two printed circuit cards designated as P.N 7052 and
P.N 7053.
The printed circuit cards should occupy the slots in the enclosure according to fig1.
Connect the flat cables between the printed circuit cards and the front panel.
The front panel must be inserted into the grooves on both sides of the case while
pressing down until a distinct "click" is heard. Assembly is completed by laying the
terminal strips in place.
Note: The terminal strips are polarized and must not be placed backwards.
5. DISTANCE SETTING
Figure 1
The DRA-DM-11 scan rate depends on the distance between the multiplexer and
the de-multiplexer. There are three jumper switches marked as 500,1Km,2Km on
the printed circuit 7052; set the jumper to the proper distance selector.
6. ALARM
The DRA-DM-11 alerts by flashing the Alarm LED and by activating the Alarm
relay, whenever there is any interruption in the communication.
The interrupt can occur due to disconnection or short-circuiting of the connection
wires, or due to failure of the DRA-M-11 power supply.
When the failure is corrected, the Alarm flashing LED will turn off and the relay
will release.
4
7. CONNECTING THE DRA-DM-11 TO DRA-M-11
The DRA-DM-11 is connected to the DRA-M-11 by a twisted pair of leads. In a
hostile environment, a shielded cable is recommended.
To avoid ground-loop problems it is recommended to use a floating power supply
and to ground, if necessary, the negative terminal of the DRA-DM-11 power
supply.
Connection Diagram
Figure 2
INPUT
OUTPUTS
Accuracy (Refer to Current Input)
Scan rates:
500m:
1Km:
2Km:
ALARM
Contact rating
INDICATORS
SUPPLY
Supply Voltage
Supply Current Consumption
FUSES
Main Fuse
Analog Input Fuse
TEMPERATURE
Operating
Storage
HUMIDITY
HOUSING
Box
Terminals
WEIGHT
DIMENSIONS
Multiplexed current loop
16, 0/4-20mA current loops
±0.1% typical, maximum ±0.25% of span
Aprox. 1000 ch/sec.
Aprox. 500 ch/sec.
Aprox. 250 ch/sec.
Dry contact (closed in an alarm)
1A at 230Vac max.
1 Yellow LED, Power-On indicator
16 Red LEDs, current output activity indicators
1 Red Alarm LED
24 ± 10% Vdc (regulated)
500mA
630mA, Fast Blow (5x20mm)
63mA, Fast Blow (5x20mm)
0 to 70
o
C (32 to 158
o
F)
-25 to +85
o
C (-13 to 185
o
F)
5 to 95% Relative humidity, non condensed
Plastic Polycarbonate
According to IP50 DIN 40050
According to IP20 DIN 40050
0.6 Kg. (1.5 lb.)
73Hx200Wx121mmD (2.88"x7.88"4.76")
8. SPECIFICATIONS
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED
RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID
PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return
package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied,
photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in
whole or in part, without prior written consent of OMEGA ENGINEERING, INC.
FOR WARRANTY RETURNS, please have the
following information available BEFORE contacting
OMEGA:
1. P.O. number under which the product was
PURCHASED,
2. Model and serial number of the product under
warranty, and
3. Repair instructions and/or specific problems
relative to the product.
FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:
1. P.O. number to cover the COST
of the repair,
2. Model and serial number of product, and
3. Repair instructions and/or specific
problems relative to the product.
WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship
for a period of 13 months from date of purchase. OMEGA Warranty adds an additional one (1) month
grace period to the normal one (1) year product warranty to cover handling and shipping time. This
ensures that OMEGA’s customers receive maximum coverage on each product. If the unit should malfunction,
it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized
Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is
found to be defective it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects
resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing,
operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if
the unit shows evidence of having been tampered with or shows evidence of being damaged as a result
of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse
or other operating conditions outside of OMEGA’s control. Components which wear are not warranted, including
but not limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes
liability for any damages that result from the use of its products in accordance
with information provided by OMEGA, either verbal or written. OMEGA warrants
only that the parts manufactured by it will be as specified and free of defects.
OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND
WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL
IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION
OF LIABILITY: The remedies of purchaser set forth herein are exclusive and the
total liability of OMEGA with respect to this order, whether based on contract,
warranty, negligence, indemnification, strict liability or otherwise, shall not exceed
the purchase price of the component upon which liability is based. In no event
shall OMEGA be liable for consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity,
medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth
in our basic WARRANTY / DISCLAIMER language, and additionally, purchaser will indemnify OMEGA and
hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.
Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…Of Course!
TEMPERATURE
⻬ Thermocouple, RTD & Thermistor Probes,
Connectors, Panels & Assemblies
⻬ Wire: Thermocouple, RTD & Thermistor
⻬ Calibrators & Ice Point References
⻬ Recorders, Controllers & Process Monitors
⻬ Infrared Pyrometers
PRESSURE, STRAIN AND FORCE
⻬ Transducers & Strain Gauges
⻬ Load Cells & Pressure Gauges
⻬ Displacement Transducers
⻬ Instrumentation & Accessories
FLOW/LEVEL
⻬ Rotameters, Gas Mass Flowmeters & Flow Computers
⻬ Air Velocity Indicators
⻬ Turbine/Paddlewheel Systems
⻬ Totalizers & Batch Controllers
pH/CONDUCTIVITY
⻬ pH Electrodes, Testers & Accessories
⻬ Benchtop/Laboratory Meters
⻬ Controllers, Calibrators, Simulators & Pumps
⻬ Industrial pH & Conductivity Equipment
DATA ACQUISITION
⻬ Data Acquisition & Engineering Software
⻬ Communications-Based Acquisition Systems
⻬ Plug-in Cards for Apple, IBM & Compatibles
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⻬ Recorders, Printers & Plotters
HEATERS
⻬ Heating Cable
⻬ Cartridge & Strip Heaters
⻬ Immersion & Band Heaters
⻬ Flexible Heaters
⻬ Laboratory Heaters
ENVIRONMENTAL
MONITORING AND CONTROL
⻬ Metering & Control Instrumentation
⻬ Refractometers
⻬ Pumps & Tubing
⻬ Air, Soil & Water Monitors
⻬ Industrial Water & Wastewater Treatment
⻬ pH, Conductivity & Dissolved Oxygen Instruments
M2615/0197
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Omega DRA-MDM-11 is a data acquisition and transmission system designed for industrial applications. It allows for the collection of data from multiple sensors and its transmission over long distances using a single pair of wires. The system consists of a multiplexer (DRA-M-11) and a demultiplexer (DRA-DM-11) unit. The multiplexer collects data from up to 16 sensors and converts it into a digital signal. The demultiplexer receives the digital signal and converts it back into analog signals for output to the sensors.
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